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Concealed mounting holes
Product sizes available to fit spiral pipe diameter 8” – 48
904 - Double Deflection Adjustable Aluminum Blade Grille For a 40" x 18" Duct Opening (front blades parallel to shortest dimension)
425 Series Engineering/Performance Data
enclosed in valve to assure trouble-free operation
Aluminum Airfoil Blade Double Deflection Diffuser 904-30X12 Residential Registers & Grilles Concealed mounting holes904 Double Deflection Adjustable Aluminum Blade Grille For a 30" x 12" Duct Opening (front blades parallel to shortest dimension) Standard Features Double deflection surface mount grille with adjustable airfoil blades Front blades parallel to shortest dimension, back blades parallel to longest dimension Extruded aluminum surface mount frame with signature line marks Provides 4 way air flow on one plane Nylon bushings on adj. blades prevent metal on
